SN65C3243DBRG4 RS232 Transceiver Equivalent & Substitute Parts

Part Overview

The SN65C3243DBRG4 is a 3/5 full-duplex RS232 transceiver manufactured by Texas Instruments, housed in a 28-SSOP package. This interface IC is designed for serial communication applications requiring RS232 protocol support with integrated driver and receiver functionality. The part is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN65C3243DBRG4
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS232
Number of Drivers/Receivers	3/5
Duplex	Full
Data Rate	1 Mbps
Voltage Supply Range	3V to 5.5V
Operating Temperature	-40°C to 85°C
Package / Case	28-SSOP (0.209", 5.30mm Width)
Receiver Hysteresis	500 mV
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the SN65C3243DBRG4 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Protocol: RS232
Number of Drivers/Receivers: 3/5
Duplex: Full
Package / Case: 28-SSOP (0.209", 5.30mm Width)
Voltage Supply Range: 3V to 5.5V
Operating Temperature: -40°C to 85°C
Mounting Type: Surface Mount

Parts meeting all these criteria are direct functional equivalents. Secondary considerations include data rate capability, receiver hysteresis specifications, product status (active vs. discontinued), and packaging format (tube, tape & reel, or cut tape).

Parameter Comparison

Part Number	Manufacturer	Protocol	Drivers/Receivers	Data Rate	Voltage Supply	Temp Range	Package	Hysteresis	Product Status
SN65C3243DBRG4	Texas Instruments	RS232	3/5	1 Mbps	3V–5.5V	-40°C–85°C	28-SSOP	500 mV	Discontinued
SN65C3243DBR	Texas Instruments	RS232	3/5	1 Mbps	3V–5.5V	-40°C–85°C	28-SSOP	500 mV	Active
ICL3245EIAZ	Renesas Electronics	RS232	3/5	1 Mbps	3V–5.5V	-40°C–85°C	28-SSOP	500 mV	Active
MAX3243EEAI+	Analog Devices/Maxim	RS232	3/5	250 kbps	3V–5.5V	-40°C–85°C	28-SSOP	500 mV	Active
MAX3243EEAI+T	Analog Devices/Maxim	RS232	3/5	250 kbps	3V–5.5V	-40°C–85°C	28-SSOP	500 mV	Active
MAX3244EEAI+	Analog Devices/Maxim	RS232	3/5	250 kbps	3V–5.5V	-40°C–85°C	28-SSOP	500 mV	Active
MAX3245EEAI+	Analog Devices/Maxim	RS232	3/5	1 Mbps	3V–5.5V	-40°C–85°C	28-SSOP	500 mV	Active
SP3243EUEA-L/TR	MaxLinear, Inc.	RS232	3/5	1 Mbps	3V–5.5V	-40°C–85°C	28-SSOP	300 mV	Active
ICL3243ECAZ	Renesas Electronics	RS232	3/5	250 kbps	3V–5.5V	0°C–70°C	28-SSOP	500 mV	Active
ICL3243ECAZ-T	Renesas Electronics	RS232	3/5	250 kbps	3V–5.5V	0°C–70°C	28-SSOP	500 mV	Active
ICL3243ECVZ	Renesas Electronics	RS232	3/5	250 kbps	3V–5.5V	0°C–70°C	28-TSSOP	500 mV	Active

Engineering Selection Recommendations

Primary Recommendation: SN65C3243DBR

The SN65C3243DBR is the direct active equivalent from Texas Instruments. It maintains identical electrical specifications (1 Mbps data rate, 500 mV hysteresis, -40°C to 85°C operating range) and packaging (28-SSOP). Product status is active with high inventory availability. This part requires no design modifications and provides the shortest qualification path.

Full-Compatibility Alternatives:

ICL3245EIAZ (Renesas Electronics) and MAX3245EEAI+ (Analog Devices/Maxim) are functionally equivalent with matching data rates (1 Mbps), operating temperature ranges (-40°C to 85°C), and 28-SSOP packaging. Both are ROHS3 compliant and actively manufactured.

Reduced Data Rate Alternatives:

MAX3243EEAI+, MAX3243EEAI+T, MAX3244EEAI+, ICL3243ECAZ, and ICL3243ECAZ-T operate at 250 kbps instead of 1 Mbps. These are suitable for applications where the lower data rate meets system requirements. ICL3243 variants operate at 0°C to 70°C, which is narrower than the original -40°C to 85°C range.

Hysteresis Variation:

SP3243EUEA-L/TR features 300 mV receiver hysteresis compared to the standard 500 mV. This lower hysteresis may provide improved noise immunity in certain signal environments but requires verification against application requirements.

Package Variation:

ICL3243ECVZ uses 28-TSSOP packaging (4.40mm width) instead of 28-SSOP (5.30mm width). This is a different footprint and requires PCB layout modification.

All recommended substitutes are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Frequently Asked Questions (FAQ)

Q: Can I use MAX3243EEAI+ as a direct replacement for SN65C3243DBRG4?

A: MAX3243EEAI+ is electrically compatible in terms of protocol (RS232), driver/receiver configuration (3/5), duplex mode (full), package (28-SSOP), and voltage supply (3V–5.5V). However, it operates at 250 kbps maximum data rate versus the original 1 Mbps. Use this part only if your application data rate does not exceed 250 kbps.

Q: What is the difference between SN65C3243DBRG4 and SN65C3243DBR?

A: Both parts are Texas Instruments RS232 transceivers with identical electrical specifications. The primary difference is packaging format: DBRG4 is in Digi-Reel format (discontinued), while DBR is available in Cut Tape and Digi-Reel formats (active status). Electrical performance and pinout are identical.

Q: Can I use ICL3243ECVZ if my PCB is designed for 28-SSOP?

A: No. ICL3243ECVZ uses 28-TSSOP packaging with a 4.40mm width, while the original SN65C3243DBRG4 uses 28-SSOP with 5.30mm width. These are different footprints and require PCB redesign. Use 28-SSOP packaged alternatives for drop-in compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts are ROHS3 compliant except SP3243EUEA-L/TR, which is RoHS compliant (not specifically ROHS3). Verify compliance requirements for your application.

Q: What is the operating temperature range difference between ICL3243ECAZ and SN65C3243DBRG4?

A: SN65C3243DBRG4 operates from -40°C to 85°C, while ICL3243ECAZ operates from 0°C to 70°C. The ICL3243 variant has a narrower temperature range and is not suitable for applications requiring -40°C operation or temperatures above 70°C.

Q: Does receiver hysteresis affect substitution compatibility?

A: Receiver hysteresis (500 mV vs. 300 mV) affects noise immunity and signal detection margins. SP3243EUEA-L/TR features 300 mV hysteresis, which may improve performance in noisy environments but requires application verification. Standard 500 mV hysteresis parts are recommended for direct replacement unless noise performance is a specific design concern.

Q: What is the Moisture Sensitivity Level (MSL) difference?

A: SN65C3243DBRG4 has MSL 1 (unlimited shelf life). Most substitutes also have MSL 1, except ICL3245EIAZ, ICL3243ECAZ, ICL3243ECAZ-T, and SP3243EUEA-L/TR, which have MSL 2 (1 year shelf life). MSL 2 parts require controlled storage conditions and have a one-year maximum shelf life from manufacturing date.

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